The role of kinetic instabilities in formation of the runaway electron current after argon injection in DIII-D

Lvovskiy, A.; Paz-Soldan, C.; Eidietis, N. W.; Dal Molin, A.; Du, X. D.; Giacomelli, L.; Herfindal, J. L.; Hollmann, E. M.; Martinelli, L.; Moyer, R. A.; Nocente, M.; Rigamonti, D.; Shiraki, D.; Tardocchi, M.; Thome, K. E.

doi:10.1088/1361-6587/aae95a

Title: The role of kinetic instabilities in formation of the runaway electron current after argon injection in DIII-D

Journal Article · Mon Jan 01 00:00:00 EST 2018 · Plasma Physics and Controlled Fusion

DOI:https://doi.org/10.1088/1361-6587/aae95a· OSTI ID:1477862

Lvovskiy, A. ^[1]; Paz-Soldan, C. ^[2]; Eidietis, N. W. ^[2]; Dal Molin, A. ^[3]; Du, X. D. ^[4]; Giacomelli, L. ^[5]; Herfindal, J. L. ^[6]; Hollmann, E. M. ^[7]; Martinelli, L. ^[3]; Moyer, R. A. ^[7]; Nocente, M. ^[3]; Rigamonti, D. ^[5]; Shiraki, D. ^[6]; Tardocchi, M. ^[5]; Thome, K. E. ^[2]

Oak Ridge Associated Univ., Oak Ridge, TN (United States)
General Atomics, San Diego, CA (United States)
Universita di Milano-Bicocca, Milan (Italy). Dipartimento di Fisica
Univ. of California, Irvine, CA (United States)
Istituto di Fisica del Plasma, Consiglio Nazionale delle Ricerche, Milan (Italy)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of California, San Diego, La Jolla, CA (United States)

Here, kinetic instabilities in the MHz range driven by runaway electrons (REs) have been observed for the rst time during the current quench in disruptions triggered by massive injection of argon in DIII-D. These instabilities are well-correlated with intermittent RE losses in the beginning of runaway electron current formation. The runaway current phase is not observed when the power of instabilities exceeds a threshold. Novel measurements of the RE distribution function during the current quench indicate that the instabilities appear when RE energy (E_RE) exceeds 2.5{3 MeV, the number of modes grows linearly with E_RE, and their frequencies lie in the range 0.1–3 MHz, below the ion cyclotron frequency. Possible plasma waves exciting by REs in this region are proposed. Increase of the amount of injected argon decreases the E_RE and increases the success rate of the runaway current formation, while increase of the pre-disruption plasma current acts in the opposite direction. No dependence on the pre-disruption core electron temperature is found.

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Research Organization:: General Atomics, San Diego, CA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: FC02-04ER54698; AC05-00OR22725

OSTI ID:: 1477862

Alternate ID(s):: OSTI ID: 1481733; OSTI ID: 1488692

Journal Information:: Plasma Physics and Controlled Fusion, Vol. 60, Issue 12; ISSN 0741-3335

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 28 works

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MARS-F modeling of post-disruption runaway beam loss by magnetohydrodynamic instabilities in DIII-D Liu, Y. Q.; Parks, P. B.; Paz-Soldan, C. Nuclear Fusion, Vol. 59, Issue 12 https://doi.org/10.1088/1741-4326/ab3f87	journal	October 2019
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